C++ Institute Exam CPP Topic 4 Question 79 Discussion

Actual exam question for C++ Institute's CPP exam

Question #: 79
Topic #: 4

[All CPP Questions]

What will happen when you attempt to compile and run the code below, assuming that file test.out do not exist before the program execution?

#include

using namespace std;

templatestruct Out {

ostream & out;

Out(ostream & o): out(o){}

void operator() (const T & val ) {out<

int main (){

int t[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

fstream f("test.out");

list l(t, t+10);

for_each(l.begin(), l.end(), Out(f));

f.close();

return 0;

}

Afile test.out will be created and opened for writing

Bfile test.out will be created and opened for reading

Cno file will be created nor opened

Dfile test.out will contain sequence 1 2 3 4 5 6 7 8 9 10

Ecompilation error

Show Suggested Answer

Suggested Answer: C

by Franklyn at Mar 08, 2024, 03:58 PM

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Ronna

25 days ago

I bet the answer is C. The code is using a template, which means it's probably trying to be way too clever for its own good. I bet the compiler just throws up its hands and refuses to compile it.

upvoted 0 times

Hmm, I'm not sure. Maybe it's option C? After all, the code doesn't explicitly check if the file exists before trying to open it. It could just fail silently. But then again, that would be a pretty lame way to handle file I/O. I'll go with option D, just to be safe.

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Ernest

1 days ago

I'm not so sure, I think it might be option D. The file will contain the sequence 1 2 3 4 5 6 7 8 9 10.

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Carmelina

4 days ago

I agree, option A seems like the most logical choice.

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Dylan

15 days ago

I think it's option A. The file will be created and opened for writing.

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